<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="$router.back()"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div  class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{article.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{article.aut_name}}</div>

          <div slot="label" class="publish-date">{{article.pubdate | relativeTime}}</div>
           <!-- $event 是事件参数 -->
           <!-- 优化写法
            :isFollowed="article.is_followed"
            @update-is_followed="article.is_followed = $event"
            简写为v-model
          -->
          <followUser
          class="follow-btn"
          :userId="article.aut_id"
          v-model="article.is_followed"
          ></followUser>
          <!-- <van-button
                    class="follow-btn"
                    round
                    size="small"
                    :loading="followLoading"
                    v-if="article.is_followed"
                    @click="onFollow"
                  >已关注</van-button>
          <van-button
          v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            @click="onFollow"
            >关注</van-button> -->

        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body"
        v-html="article.content"
        ref="article-content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论 -->
        <CommentList :source="article.art_id"
        @onload-success="totalCommentCount = $event.total_count"
        :list="commentList"
        @replyClick="onReplyClick"
        />
        <!-- 文章评论end -->
         <!-- 底部区域 -->
    <div class="article-bottom">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="isPostShow = true"
      >写评论</van-button>
      <van-icon
        name="comment-o"
        :info="totalCommentCount"
        color="#777"

      />
      <CollectArticle  class="btn-item"
      v-model="article.is_collected"
      :articleId="article.aut_id"
      />
      <!-- <van-icon
        color="#777"
        name="star-o"
      /> -->
      <!-- // 点赞功能 -->
      <likeArticle class="btn-item"
        v-model="article.attitude"
        :articleId="article.art_id"
      />
      <!-- <van-icon
        color="#777"
        name="good-job-o"
      /> -->
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->
    <!-- 发布评论 -->

    <van-popup v-model="isPostShow"
    position="bottom"
    >
    <CommentPost :target="article.art_id"
    @post-success="onPostSuccess"
    />
  </van-popup>
    <!-- 发布评论 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errStatus ===404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon  name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click="loadArticle" class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 评论回复 -->
    <van-popup
        v-model="isReplyShow"
        position="bottom"
        style="height:100%"
    >
    <CommentReply v-if="isReplyShow"
    :comment="currentComment"
    @close="isReplyShow=false"
    />
  </van-popup>
    <!-- 评论回复结束 -->
  </div>
</template>

<script>
import relativeTime from 'dayjs/plugin/relativeTime'
import { getArticleById } from '../../api/article'
import { ImagePreview } from 'vant'
import followUser from '@/components/follow-user/index.vue'
import CollectArticle from '@/components/collect-article'
import likeArticle from '@/components/like-article'
import CommentList from './comments/comment-list.vue'
import CommentPost from './comments/comment-post.vue'
import CommentReply from './comments/comment-reply.vue'
export default {
  name: 'ArticleIndex',
  components: { CommentPost, followUser, CollectArticle, likeArticle, CommentList, CommentReply },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  // 给所有的后代提供数据
  provide: function () {
    return {
      articleId: this.articleId
    }
  },
  data () {
    return {
      article: {}, // 文章详情
      loading: true, // 加载中的状态
      errStatus: 0, // 失败的状态码
      followLoading: false,
      totalCommentCount: 0,
      isPostShow: false, // 控制弹出层的展示  评论
      commentList: [], // 评论列表
      isReplyShow: false,
      currentComment: {} // 当前点击评论的回复
    }
  },
  computed: {},
  watch: {},
  created () {
    this.loadArticle()
  },
  mounted () {},
  methods: {
    async loadArticle () {
      this.loading = true
      try {
        const { data } = await getArticleById(this.articleId)

        this.article = data.data
        // 请求成功，初始化图片点击预览
        setTimeout(() => {
          this.perviewImage()
        })
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatus = 404
        }
        console.log('数据请求失败', err)
      }
      // 无论成功还是失败 都要关闭loading
      this.loading = false
    },
    perviewImage () {
      const articleContent = this.$refs['article-content']
      const imgs = articleContent.querySelectorAll('img')
      const images = []
      imgs.forEach((img, index) => {
        // 接口的很多图片url已经没有了，所以会报404  只有手撕代码，你怕不怕那个标题里面还有两张图片可以看到效果
        images.push(img.src)
        img.onclick = () => {
          ImagePreview({
            images,
            // 起始位置，从0开始
            startPosition: index

          })
        }
      })
    },
    // changeCommentCount (val) {
    //   this.totalCommentCount = val
    // },
    onPostSuccess (data) {
      this.isPostShow = false
      this.commentList.unshift(data.new_obj)
    },
    onReplyClick (comment) {
      this.currentComment = comment
      this.isReplyShow = true
    }

  }
}
</script>

<style scoped lang="less">
@import "./github-markdown.css";
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 46px;
    bottom: 44px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 20px;
      padding: 25px 16px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 16px;
      .avatar {
        width: 35px;
        height: 35px;
        margin-right: 8.5px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 12px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 11.5px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 85px;
        height: 29px;
      }
    }

    .article-content {
      padding: 27.5px 16px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 100px 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 100px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 61px;
      color: #b4b4b4;
    }
    .text {
      font-size: 15px;
      color: #666666;
      margin: 16.2px 0 23px;
    }
    .retry-btn {
      width: 140px;
      height: 35px;
      line-height: 35px;
      border: 1px solid #c3c3c3;
      font-size: 15px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 40px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 141px;
      height:35px;
      border: 1px solid #eeeeee;
      font-size: 15px;
      line-height: 11.5px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size:20px;
      .van-info {
        font-size: 11px;
        background-color: #e22829;
      }
    }
  }
}
</style>
